T3D Re: stereo math

[john bercovitz <bercov@xxxxxxxxxxx>]

Greg E. relates his experience with viewing a pair from different
distances, finding more distant easier for a lot of deviation.

Seems like an easy enough test could be done using a projected pair
and walking closer to and farther from the screen to discover limits.

Dr. T writes:
>> Not so long ago I wrote to P3D: THINK IN ANGLES.
> Can you please repost this in T3d?  

I second the motion.  Sounds very interesting.

Dr. T writes:
> The 1.2 mm mofd was elevated from a conventional maximum to some 
> kind of "optimum", something to be achieved in any stereo pair
> recorded with a variable base.

Well, I guess if you always want to maximize the depth in your 
pairs, you could use it this way.  MAOFD stands for maximum
_allowable_ on-film deviation.  Of course it's a somewhat soft
maximum allowable, in my experience.  In my shots, I don't much 
worry about it unless I think I might get close to the maximum.  
Of course I don't try to minimize on-film deviation, either.  8-)

As you know, I don't use a variable base except as a special effect
such as when trying to make miniatures full size or trying to scale
the Grand Canyon down to the point where one can see depth across it.

John B


------------------------------